Duel Binding does not return back to Client

william

15y1.7k

Hi All,

I have a Service Layer object that calls a WCF Service. The WCF Service needs to return data back to the Service Layer Object.
The projects are all .Net 4.0.
I have attached my wcf service and the service Layer object that is trying to consume the wcf service. When I run the wcf Service, the code in the wcf service gets to the callback operation returning channel.
the consumer service, obviously calls the Rates method in the wcf service, and the waitForResponse.WaitOne(); method is called. from the client side it then drops after some time into the exception handler and says that it did not receive a timely response from the service. Even though the service had long gone into the callback statement.
Can anybody see why the OnRatabaseCallback does not get returned to.

7 Replies

Know the answer? Post it — somebody with the same question will find it here.

Suthish Nair15y ago
The default operation timeout on a WCF client channel is 00:01:00

http://final-proj.blogspot.com/2009/09/wcf-timeouts.html
william15y ago
Im using a background worker in the WCF Service. But from the client call to the WCf Service as far as I am aware I am not.

I have enabled WCF Tracing on the service, but this doesn't give any indication. I can see that the callback with the data I want to send back to the client has been initiated. But it never gets back to the client.

If you download my code in the original mail, although you cannot run as is without a few changes, you can at least see the config files and the code at either side. Hopefully, someone may see something obvious from just looking at my code.

I have also since posting for now commented out any calls to the background worker object on the wcf service. such that all I have in my method is a reference to the OperationContext and then sending the callback to the client, but it still acts in the same way.

e.g.
void IRatabaseService.Rates(string Data)
{
IRatabaseXmlReturn callback = OperationContext.Current.GetCallbackChannel();
callback.OnRatabaseCallback("hello");
}
Suthish Nair15y ago
Are you using Threading? If yes then that might causing the problem..
william15y ago
I receive a timeout error on the client, but this is after 1 minute from the wcf service doing the callback. Both projects are on the same machine at the moment, so there are no network issues.
Suthish Nair15y ago
The error might due to time out.
william15y ago
Hi Yes,

This isn't the full solution code. The project itself is huge. The error you are receiving is because this is a third party dll that we are using.

In essence you can comment out the whole of the code in worker_dowork and just place e.Result = "mytext". since I know this bit all works. I gave all the code for completeness, I'm happy with the background worker stuff.

The code returns into the worker_runWorkerCompleted function and then goes into a black hole never returning to the client.
Mamta M15y ago
I downloaded the file and tried running it. It says "Error 1 The type or namespace name 'CCGIRBGALib' could not be found (are you missing a using directive or an assembly reference?) "